Maybe model. Work as they should with no issues includes answer phone.
BT Home Phones With Answering Machine
BT 8500 Phones with Answering Machine & True Call Nuisance Blocking, Trio
BT 8500 Phones with Answering Machine & True Call Nuisance Blocking - Pack of 3
BT Everyday Phones With Call Blocking Twin Set
BT Everyday Phones with Call Blocking Two Handsets Unused
